Article
Geosciences, Multidisciplinary
Zhanlei Wang, Bingzheng Guo, Chan Jiang, Lin Qi, Yuqiang Jiang, Yifan Gu, Yonghong Fu, Demin Liang
Summary: The Lower Permian Shanxi Formation in the Eastern Ordos Basin is a key target for shale gas exploration in China. This study used comprehensive methods to investigate the lithofacies and pore structure of the shale. The results showed that there are five different lithofacies types, with lithofacies V and lithofacies VI being the best in terms of pore morphology, connectivity, and development degree. Organic pore morphology was found to be closely related to the type of kerogen present, with sapropelinite contributing to better development of organic pores.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Dangyu Song, Yu Qiao, Weiqing Liu, Xinbin Zhang, Zhen Yu, Guoqin Wei
Summary: This paper quantitatively characterized the nanopore structure of transitional shale and analyzed the origin of nanopores. The results showed that organic pores have an absolute advantage in methane adsorption in transitional shales.
Article
Chemistry, Multidisciplinary
Guanlin Li, Yinghai Guo, Huaichang Wang, Xiaokai Yang, Yundong Hou, Shiyue Ye, Kunzhe Zhang
Summary: In this study, the pore-throat structure and lithological and fractal characteristics of fine-grained sandstone reservoirs in the Ordos Basin were investigated using various experiments. The results show that the sandstone samples can be categorized into different types based on their composition. The main reservoir space, micropore-throat, was found to be the dominant factor in the difference of physical properties among the samples. The relationship between pore-throat morphology and rock composition was also analyzed, indicating the importance of pores and throats in determining the fractal dimension.
Article
Energy & Fuels
Zhen Qiu, Dongjun Song, Leifu Zhang, Qin Zhang, Qun Zhao, Yuman Wang, Hanlin Liu, Dexun Liu, Shuxin Li, Xingtao Li
Summary: The Permian Shanxi Formation in China is expected to be a potential economic gas shale for exploration and development, with organic-rich shales enriched in clay minerals and mesopores as the predominant pore type. The development of organic-hosted pores in the shale exhibits differences when compared to marine gas shales globally, attributed to variations in kerogen types. However, the presence of micropores and mesopores in the samples indicates sufficient space for gas storage, providing crucial theoretical guidance for further exploration and development of transitional shale gas.
Article
Geosciences, Multidisciplinary
Yifan Gu, Xingtao Li, Lin Qi, Shuxin Li, Yuqiang Jiang, Yonghong Fu, Xiaoshuai Yang
Summary: In this study, the Shanxi Formation Shan 2(3) Submember transitional shale in the Eastern Ordos Basin was investigated using petrographic, mineralogical, and high-resolution geochemical analyses. The results revealed the sedimentary environment, detrital influx, paleoclimate, paleosalinity, and paleoredox conditions of the submember. The submember was found to be divided into four sections with different facies and characteristics, including bay facies with high TOC values, low detrital influx, and relatively anoxic reduction conditions, and transitional facies dominated by barrier island, lagoon, tidal flat, and swamp.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Qin Zhang, Zhen Qiu, Qun Zhao, Leifu Zhang, Dazhong Dong, Yuman Wang, Wei Hou, Shuxin Li, Xingtao Li
Summary: Transitional Permian shales in China are significant targets for shale gas due to their abundant resources. This study analyzed the pore structures of Shanxi Formation shale using various techniques, showing the influence of organic and inorganic components on gas storage capacity and adsorption.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
Tao Wang, Fenghua Tian, Ze Deng, Haiyan Hu, Zhitao Xie
Summary: This study investigates the pore structure of shale samples from the Shanxi Formations in the Ordos Basin. The results show that the shale pores mainly consist of mesopores, with diameters ranging from 10 nm to 40 nm, and contribute significantly to the pore volume. The total pore volume is influenced by the TOC content, organic matter maturity, and illite/smectite mixed layer content. High-pressure methane adsorption experiments reveal that the micropores have a large specific surface area, which controls the adsorbed gas content of the shale, while mesopores provide the majority of the pore volume and macropores act as migration channels for shale gas.
Article
Energy & Fuels
Wu Jin, Wang Hongyan, Shi Zhensheng, Wang Qi, Zhao Qun, Dong Dazhong, Li Shuxin, Liu Dexun, Sun Shasha, Qiu Zhen
Summary: The shale lithofacies of the Shan(2)(3) sub-member in the east margin of the Ordos Basin were systematically analyzed in this study. The shale in this area was found to have various lithofacies with distinct differences in pore structure, with organic pores and mineral interparticle pores being well developed.
PETROLEUM EXPLORATION AND DEVELOPMENT
(2021)
Article
Energy & Fuels
Shutong Li, Yang Wang, Ximeng Wang, Ruiliang Guo
Summary: The pore system and gas adsorption characteristics of mudstones in the Ordos Basin were studied. The results show that the studied mudstones are mainly siliceous rocks with intergranular pores and less developed organic matter pores. Micropores and mesopores are the main pore types, with abundant organic matter pores. The presence of rigid minerals can inhibit the compaction of intergranular pores. Organic matter, clays, and rigid minerals have a limited positive effect on gas adsorption capacity. Methane is mainly stored in micropores.
Article
Geosciences, Multidisciplinary
Shuai Shi, Jinxian He, Xiaoli Zhang, Hongchen Wu, Ziqi Yu, Jian Wang, Tiantian Yang, Wei Wang
Summary: Studying the complex pore structures and fractal characteristics of gas shale is important for understanding the mechanism of shale gas accumulation and efficient development. This paper utilizes the fractal theory together with mercury intrusion porosimetry and N-2 adsorption technology to investigate the pore size distribution of shale samples. The results reveal that the most common pore types in the samples are pores between or within clay minerals, micropores and mesopores inside organic matter, and microfractures. The pores of shale samples exhibit fractal geometries, and the fractal dimension correlates positively with the corresponding pore volume.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geochemistry & Geophysics
H. Wang, L. Zhang, Q. Zhao, Z. Qiu, D. Liu, Q. Zhang, Y. Wang, D. Dong
Summary: The pore types and structure parameters of heterogenetic shale will impact the percolation and reservoir properties, emphasizing the importance of researching these parameters. Analyzing different pore types and characteristics in the Lower Permian Shanxi Formation and Taiyuan Formation revealed varying mineral compositions and pore structures, affecting porosity and pore size. Methane adsorption analysis showed differences in pore size distribution between the Shanxi Formation and Taiyuan Formation, with the latter having larger micropores.
Article
Geosciences, Multidisciplinary
Jin Wu, Xiaowei Zhang, Hao Xu, Yufeng Xiao, Guiying Liu, Lingfeng Jiang, Naier Deng, Zihe Ren
Summary: This paper investigated the pore evolution in marine-continental transitional shale through high-temperature and high-pressure in-situ thermal simulation experiments. It found that an increase in thermal maturity generates more pores and hydrocarbon generation leads to the increase of both organic and mineral pores, along with changes in mineral composition. The evolution of shale pore system can be divided into three stages with increasing thermal maturity, with the high maturity period being crucial for extensive pyrolysis and shale gas generation.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Chemical
Daxing Wang, Zhitao Xie, Haiyan Hu, Tao Wang, Ze Deng
Summary: This study uses low-pressure CO2 adsorption (LP-CO(2)A) and low-temperature N-2 adsorption (LT-N(2)A) methods, combined with field emission scanning electron microscopy (FE-SEM), geochemistry, and mineral composition analysis, to study the microscopic pore characteristics of the marine-continental transitional shale in the Daning-Jixian block of the Shanxi Formation. The study found that the shale has diverse pore types with relatively large pore sizes, and the dominant pore types are organic and intragranular pores. The distribution of shale pore fractal dimensions is relatively concentrated, and they are correlated with various factors such as TOC content and clay mineral content.
Article
Energy & Fuels
Bangsheng Zhao, Rongxi Li, Xiaoli Qin, Ning Wang, Wei Zhou, Ahmed Khaled, Di Zhao, Yanni Zhang, Xiaoli Wu, Qi Liu
Summary: The marine-continental transitional shale in the Lower Permian Shanxi Formation of the southeast Ordos Basin is mainly composed of clay and quartz, with relatively high TOC contents and thermal maturity. Terrestrial input, warm and humid climate conditions, and redox environments are the primary factors controlling organic matter accumulation in the Shanxi shale, while low paleoproductivity plays a lesser role.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Yuanyuan Yang, Jinchuan Zhang, Longfei Xu, Pei Li, Yang Liu, Wei Dang
Summary: The pore structure characteristics of deep shale in the Shanxi Formation are studied, showing low pore surface area and pore volume, with mainly mesoporous pore diameter. The complexity of the pore structure is greater than that of the pore surface. The development of microfractures contributes to the pore development in the deep shale.
Article
Geosciences, Multidisciplinary
Weijiao Ma, Jinbu Li, Min Wang
Summary: The petroleum resource assessment obtained from laboratory tests on old core samples tends to underestimate the in situ resources. This study investigates the hydrocarbon loss and restoration by comparing preserved and exposed core samples. It is found that previous studies have severely underestimated the in situ hydrocarbon potential due to factors such as sample crushing and crucible waiting. A new restoration model is proposed to compensate for these losses.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Shaoyun Chen, Yongqiang Yang, Longwei Qiu, Xiaojuan Wang, Erejep Habilaxim
Summary: Quartz cement is an important authigenic mineral in the tight sandstones of the Shaximiao Formation in the Sichuan Basin. This study analyzed the silicon sources of the quartz cement using mineralogical, fluid inclusion, and geochemical data. The results showed that smectite alteration and dissolution of aluminosilicate minerals were the primary sources of silicon for quartz cementation. Contributions from volcanic material hydrolysis and pressure solution were relatively minor. The presence of chlorite films inhibited the development of quartz overgrowths and had minimal impact on reservoir quality.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xing Jian, Ping Guan, Ling Fu, Wei Zhang, Xiaotian Shen, Hanjing Fu, Ling Wang
Summary: This study presents a synthesis of new detrital zircon dating results and published data from the Cenozoic Qaidam basin, revealing the spatiotemporal variation of detrital zircon age populations and supporting models of synchronous deformation in northern Tibet. The study emphasizes the importance of considering textural and sedimentological parameters in zircon provenance interpretations, as well as the need for integrated provenance analysis involving other detritus components.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
A. Peketi, G. Sriram, A. Mazumdar, P. Dewangan, A. Zatale, V. Rajurkar, Gayatri Shirodkar, V. Mahale, V. Yatheesh
Summary: This study investigates 13 submarine seamounts in the southern Andaman volcanic arc and observes evidence of hydrothermal activity in one of the seamounts. The evidence includes plumes rich in dissolved gases, live chemosymbiotic organisms, and the deposition of neoforming minerals. These observations suggest the development of a new hydrothermal field in the least explored Andaman Sea.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Yanxian Zhu, Zhiliang He, Xiaowen Guo, Long Li, Sheng He, Jian Gao, Shuangjian Li, Huili Li
Summary: This study investigates the fluid evolution history of the hydrothermal dolomite reservoir in the Middle Permian Maokou Formation in the Sichuan Basin. The results reveal the diagenetic sequences, mineral origins, salinity history, and pressure evolution using various analytical techniques. The findings provide important insights into the gas charge, escape, and preservation conditions of the reservoir.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Rafaella de Carvalho Antunes, Julia Campos Guerrero, Ricardo Jorge Jahnert
Summary: This study presents a detailed sedimentary model and identifies various sedimentary facies associations in the coquina deposits of the Itapema Formation in the offshore pre-salt Buzios Field of the Santos Basin. These facies associations were primarily influenced by waves and currents and reflect a complex depositional system.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Kang Meng, Tongwei Zhang, Deyong Shao, Xiuyan Liu, Hui Song, Heng Peng
Summary: In this study, an integrated method of measuring optical reflectance and Raman spectroscopy is proposed to accurately determine the thermal maturity of Lower Cambrian shales in South China. The results show that this method is reliable and effective, and it has important implications for analyzing overmature shale.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Mohamed A. K. El-Ghali, Olga Shelukhina, Iftikhar Ahmed Abbasi, Mohamed S. H. Moustafa, Osman Salad Hersi, Numair A. Siddiqui, Khalid Al-Ramadan, Abdullah Alqubalee, Abdulwahab Muhammad Bello, Abduljamiu O. Amao
Summary: This study employs an integrated depositional and sequence stratigraphic approach to assess the control of diagenesis on reservoir porosity of a hybrid-energy delta system. The study focuses on the Barik Formation in the Haushi-Huqf region of Central Oman, which represents a highstand system tract of a hybrid-energy delta. The assessments reveal that the reservoir porosity is controlled by various degrees of diagenetic processes, including mechanically infiltrated clays and kaolinitization of silicate grains.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Xiaocan Yu, Chunlian Wang, Hua Huang, Kai Yan
Summary: Oilfield brines are a significant alternative lithium resource. This study investigates the metallogenic characteristics and enrichment process of oilfield brines from the Jianghan Basin, central China using chemical and multi-isotope data. The results suggest that lithium enrichment in these brines is the result of interaction with clastic host rocks and dilution by meteoric water.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Jianghao Qiao, Xiwu Luan, Thanuja D. Raveendrasinghe, Yintao Lu, Guozhang Fan, Xinyuan Wei, Long Jin, Jian Yin, Haozhe Ma, Lushan Jiang
Summary: This study investigates the Tanintharyi passive continental margin in the Andaman Sea and reveals the potential of the Oligocene/Early Miocene carbonate platform in the region as a significant hydrocarbon reservoir. It also examines the influence of changes in sedimentary facies and the tectonic setting of the Andaman Sea on the evolution of pockmarks.
MARINE AND PETROLEUM GEOLOGY
(2024)
Article
Geosciences, Multidisciplinary
Anastasios Nikitas, Georgios Makrodimitras, Maria V. Triantaphyllou, Nikolaos Pasadakis, Kimon Christanis, Stavros Kalaitzidis, Grigoris Rousakis, Ioannis Panagiotopoulos, Alexandra Gogou, Alexandros Papadopoulos, Efthimios Tartaras, Aristofanis Stefatos
Summary: Due to the lack of deep wells in the broader region, studying mud volcanic deposits can improve the geological understanding of the Mediterranean Ridge. In this study, biostratigraphic and geochemical analyses were performed on mud breccia deposits from five Mud Volcanoes in the central MR. The results indicate the origin of these deposits and provide insights into the source rock potential. Seismic data is also used to determine the distribution of major lithostratigraphic formations.
MARINE AND PETROLEUM GEOLOGY
(2024)